Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o Estado, quando o From é "830 a.C."?
 ###Tabelas: CREATE TABLE player_statistics (player_statistics_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, National team career VARCHAR, Goals VARCHAR, Caps VARCHAR, Average VARCHAR) CREATE TABLE results_by_year (results_by_year_id AUTO_INCREMENT PRIMARY KEY, Year INT, Men's Open VARCHAR, Women's Open VARCHAR, Mixed Open VARCHAR, Men's u20 VARCHAR, Women's u20 VARCHAR, Senior Mixed VARCHAR, Men's 30 VARCHAR, Women's 30 VARCHAR, Men's 35 VARCHAR, Women's 35 VARCHAR, Men's 40 VARCHAR, Women's 40 VARCHAR, Men's 45 VARCHAR, Men's 50 VARCHAR) CREATE TABLE main_songlist (main_songlist_id AUTO_INCREMENT PRIMARY KEY, Track INT, Song Title VARCHAR, Artist VARCHAR, Album VARCHAR, Legends Track? VARCHAR) CREATE TABLE vassal_states (vassal_states_id AUTO_INCREMENT PRIMARY KEY, State VARCHAR, Type VARCHAR, Name VARCHAR, Title VARCHAR, Royal house VARCHAR, From VARCHAR) CREATE TABLE record_vs._other_opponents_at_least_15_games_played (record_vs._other_opponents_at_least_15_games_played_id AUTO_INCREMENT PRIMARY KEY, Missouri vs. VARCHAR, Overall Record VARCHAR, at Columbia VARCHAR, at Opponent's Venue VARCHAR, at Neutral Site VARCHAR, Last 5 Meetings VARCHAR, Last 10 Meetings VARCHAR, Current Streak VARCHAR)  
SELECT State FROM vassal_states WHERE From = 830 bc